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Flexible and Conductive MXene Films and Nanocomposites with High Capacitance
Book chapter   Open access

Flexible and Conductive MXene Films and Nanocomposites with High Capacitance

Zheng Ling, Chang E. Ren, Meng-Qiang Zhao, Jian Yang, James M. Giammarco, Jieshan Qiu, Michel W. Barsoum and Yury Gogotsi
MXenes, pp 563-581
2023
DOI: https://doi.org/10.1201/9781003306511-28
url
https://www.osti.gov/biblio/1286810View
SubmittedOpen Access (License Unspecified),  Open

Abstract

MXenes, a new family of 2D materials, combine hydrophilic surfaces with metallic conductivity. Delamination of MXene produces single-layer nanosheets with thickness of about a nanometer and lateral size of the order of micrometers. The high aspect ratio of delaminated MXene renders it promising nanofiller in multifunctional polymer nanocomposites. Herein, Ti3C2T x MXene was mixed with either a charged polydiallyldimethylammonium chloride (PDDA) or an electrically neutral polyvinyl alcohol (PVA) to produce Ti3C2T x /polymer composites. The asfabricated composites are flexible and have electrical conductivities as high as 2.2 × 104 S/m in the case of the Ti3C2T x /PVA composite film and 2.4 × 105 S/m for pure Ti3C2T x films. The tensile strength of the Ti3C2T x /PVA composites was significantly enhanced compared with pure Ti3C2T x or PVA films. The intercalation and confinement of the polymer between the MXene flakes not only increased flexibility but also enhanced cationic intercalation, offering an impressive volumetric capacitance of ∼530 F/cm3 for MXene/PVA-KOH composite film at 2 mV/s. To our knowledge, this study is a first, but crucial, step in exploring the potential of using MXenes in polymer-based multifunctional nanocomposites for a host of applications, such as structural components, energy storage devices, wearable electronics, electrochemical actuators, and radiofrequency shielding, to name a few.

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